Add "render-only" option to "task" command

This new option provides to the user the ability to output the rendered
input files. This option could be useful in case the input files are
Jinja2 templates, depending on input arguments. The user can preview
the rendered input tasks files without executing them.

JIRA: YARDSTICK-1020

Change-Id: Ib15ade7e1adcb29beae5e635fb5d02045c4432bb
Signed-off-by: Rodolfo Alonso Hernandez <rodolfo.alonso.hernandez@intel.com>

1 files changed, 12 insertions, 0 deletions

diff --git a/yardstick/common/exceptions.py b/yardstick/common/exceptions.py
index 41d7b8830..68f9995a2 100644
--- a/yardstick/common/exceptions.py
+++ b/yardstick/common/exceptions.py
@@ -83,3 +83,15 @@ class ScenarioConfigContextNameNotFound(YardstickException):
 
 class StackCreationInterrupt(YardstickException):
     message = 'Stack create interrupted.'
+
+
+class TaskRenderArgumentError(YardstickException):
+    message = 'Error reading the task input arguments'
+
+
+class TaskReadError(YardstickException):
+    message = 'Failed to read task %(task_file)s'
+
+
+class TaskRenderError(YardstickException):
+    message = 'Failed to render template:\n%(input_task)s'